High Rpm == Screech

[tiberis]

Just wondering if anyone has come across this problem with their car/ if they know anything about it.

when i get the revs over about 4500-5000+ i hear a screeching which sounds like it is coming from the engine bay. as far as i can tell it's engine rpm related because it doesn't matter what gear i am in.

car is R33 with RB25DET. completely stock... not even a POD filter or exhaust upgrade. could it be something with turbo and the high stage boost?

any hints would be much appreciated.

[PM-R33]

Take the intake pipes off the turbo and check inside the compressor housing for any signs of damage. Hard to say without hearing the noise, but a high pitched screech usually is when the compressor wheel scrapes against the housing ie. shagged turbo.

[tuk32R]

also maybe its one of the belts-fan belt /power steering belt, slipping at higher revs,.check their tensions..

[ARTZ]

dude....I just did mine ,had same problem....turbo/manifold bolts lose...just take heat shield of your turbo and look at the bolts holding the turbo onto the manifold i bet ya there loose.The screech is just exhaust gases escaping through the small gap...There a bitch to tighten to, but i tightened mine with my fingers and the noise stopped.... Also manifold/engine bolts are apparently a problem too....

Good Luck!!

[tiberis]

sounds like i have some investigating to do...

pretty sure its not the belts as i checked them when i got the car about a month ago... and i only have 2 to check.

i hope it's just some loose nuts rather than a dying/ dead turbo.

[StealthX]

Check for air leaks in your intercooler piping and exhaust work! good luck!

[Craved]

when its cold start it up and have someone put their hand over the exhaust tip to "seal" it - should create enough pressure to hear if a gasket is leaking in the engine bay